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@ -0,0 +1,232 @@
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From b1e75376cc3adfc7da5502a277dfe9711f3e0536 Mon Sep 17 00:00:00 2001
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From: Mårten Nordheim <marten.nordheim@qt.io>
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Date: Tue, 25 Jun 2024 17:09:35 +0200
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Subject: [PATCH] HTTP2: Delay any communication until encrypted() can be responded to
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We have the encrypted() signal that lets users do extra checks on the
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established connection. It is emitted as BlockingQueued, so the HTTP
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thread stalls until it is done emitting. Users can potentially call
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abort() on the QNetworkReply at that point, which is passed as a Queued
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call back to the HTTP thread. That means that any currently queued
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signal emission will be processed before the abort() call is processed.
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In the case of HTTP2 it is a little special since it is multiplexed and
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the code is built to start requests as they are available. This means
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that, while the code worked fine for HTTP1, since one connection only
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has one request, it is not working for HTTP2, since we try to send more
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requests in-between the encrypted() signal and the abort() call.
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This patch changes the code to delay any communication until the
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encrypted() signal has been emitted and processed, for HTTP2 only.
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It's done by adding a few booleans, both to know that we have to return
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early and so we can keep track of what events arose and what we need to
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resume once enough time has passed that any abort() call must have been
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processed.
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Fixes: QTBUG-126610
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Pick-to: 6.8 6.7 6.5 6.2 5.15 5.12
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Change-Id: Ic25a600c278203256e35f541026f34a8783235ae
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Reviewed-by: Marc Mutz <marc.mutz@qt.io>
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Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
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---
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diff --git a/src/network/access/qhttp2protocolhandler.cpp b/src/network/access/qhttp2protocolhandler.cpp
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index 39dd4608..bc1dac68 100644
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--- a/src/network/access/qhttp2protocolhandler.cpp
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+++ b/src/network/access/qhttp2protocolhandler.cpp
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@@ -371,12 +371,12 @@ bool QHttp2ProtocolHandler::sendRequest()
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}
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}
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- if (!prefaceSent && !sendClientPreface())
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- return false;
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-
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if (!requests.size())
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return true;
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+ if (!prefaceSent && !sendClientPreface())
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+ return false;
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+
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m_channel->state = QHttpNetworkConnectionChannel::WritingState;
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// Check what was promised/pushed, maybe we do not have to send a request
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// and have a response already?
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diff --git a/src/network/access/qhttpnetworkconnectionchannel.cpp b/src/network/access/qhttpnetworkconnectionchannel.cpp
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index 7620ca16..e15b0810 100644
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--- a/src/network/access/qhttpnetworkconnectionchannel.cpp
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+++ b/src/network/access/qhttpnetworkconnectionchannel.cpp
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@@ -255,6 +255,10 @@ void QHttpNetworkConnectionChannel::abort()
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bool QHttpNetworkConnectionChannel::sendRequest()
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{
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Q_ASSERT(!protocolHandler.isNull());
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+ if (waitingForPotentialAbort) {
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+ needInvokeSendRequest = true;
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+ return false; // this return value is unused
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+ }
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return protocolHandler->sendRequest();
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}
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@@ -267,21 +271,28 @@ bool QHttpNetworkConnectionChannel::sendRequest()
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void QHttpNetworkConnectionChannel::sendRequestDelayed()
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{
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QMetaObject::invokeMethod(this, [this] {
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- Q_ASSERT(!protocolHandler.isNull());
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if (reply)
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- protocolHandler->sendRequest();
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+ sendRequest();
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}, Qt::ConnectionType::QueuedConnection);
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}
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void QHttpNetworkConnectionChannel::_q_receiveReply()
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{
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Q_ASSERT(!protocolHandler.isNull());
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+ if (waitingForPotentialAbort) {
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+ needInvokeReceiveReply = true;
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+ return;
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+ }
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protocolHandler->_q_receiveReply();
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}
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void QHttpNetworkConnectionChannel::_q_readyRead()
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{
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Q_ASSERT(!protocolHandler.isNull());
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+ if (waitingForPotentialAbort) {
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+ needInvokeReadyRead = true;
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+ return;
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+ }
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protocolHandler->_q_readyRead();
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}
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@@ -1289,7 +1300,18 @@ void QHttpNetworkConnectionChannel::_q_encrypted()
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// Similar to HTTP/1.1 counterpart below:
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const auto &pairs = spdyRequestsToSend.values(); // (request, reply)
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const auto &pair = pairs.first();
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+ waitingForPotentialAbort = true;
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emit pair.second->encrypted();
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+
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+ // We don't send or handle any received data until any effects from
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+ // emitting encrypted() have been processed. This is necessary
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+ // because the user may have called abort(). We may also abort the
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+ // whole connection if the request has been aborted and there is
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+ // no more requests to send.
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+ QMetaObject::invokeMethod(this,
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+ &QHttpNetworkConnectionChannel::checkAndResumeCommunication,
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+ Qt::QueuedConnection);
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+
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// In case our peer has sent us its settings (window size, max concurrent streams etc.)
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// let's give _q_receiveReply a chance to read them first ('invokeMethod', QueuedConnection).
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QMetaObject::invokeMethod(connection, "_q_startNextRequest", Qt::QueuedConnection);
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@@ -1307,6 +1329,28 @@ void QHttpNetworkConnectionChannel::_q_encrypted()
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}
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}
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+void QHttpNetworkConnectionChannel::checkAndResumeCommunication()
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+{
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+ Q_ASSERT(connection->connectionType() == QHttpNetworkConnection::ConnectionTypeSPDY
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+ || connection->connectionType() == QHttpNetworkConnection::ConnectionTypeHTTP2
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+ || connection->connectionType() == QHttpNetworkConnection::ConnectionTypeHTTP2Direct);
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+
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+ // Because HTTP/2 requires that we send a SETTINGS frame as the first thing we do, and respond
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+ // to a SETTINGS frame with an ACK, we need to delay any handling until we can ensure that any
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+ // effects from emitting encrypted() have been processed.
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+ // This function is called after encrypted() was emitted, so check for changes.
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+
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+ if (!reply && spdyRequestsToSend.isEmpty())
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+ abort();
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+ waitingForPotentialAbort = false;
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+ if (needInvokeReadyRead)
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+ _q_readyRead();
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+ if (needInvokeReceiveReply)
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+ _q_receiveReply();
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+ if (needInvokeSendRequest)
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+ sendRequest();
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+}
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+
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void QHttpNetworkConnectionChannel::requeueSpdyRequests()
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{
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QList<HttpMessagePair> spdyPairs = spdyRequestsToSend.values();
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diff --git a/src/network/access/qhttpnetworkconnectionchannel_p.h b/src/network/access/qhttpnetworkconnectionchannel_p.h
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index d8ac3979..eac44464 100644
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--- a/src/network/access/qhttpnetworkconnectionchannel_p.h
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+++ b/src/network/access/qhttpnetworkconnectionchannel_p.h
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@@ -107,6 +107,10 @@ public:
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QAbstractSocket *socket;
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bool ssl;
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bool isInitialized;
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+ bool waitingForPotentialAbort = false;
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+ bool needInvokeReceiveReply = false;
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+ bool needInvokeReadyRead = false;
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+ bool needInvokeSendRequest = false;
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ChannelState state;
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QHttpNetworkRequest request; // current request, only used for HTTP
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QHttpNetworkReply *reply; // current reply for this request, only used for HTTP
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@@ -187,6 +191,8 @@ public:
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void closeAndResendCurrentRequest();
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void resendCurrentRequest();
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+ void checkAndResumeCommunication();
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+
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bool isSocketBusy() const;
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bool isSocketWriting() const;
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bool isSocketWaiting() const;
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diff --git a/tests/auto/network/access/http2/tst_http2.cpp b/tests/auto/network/access/http2/tst_http2.cpp
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index bf8c7799..8ed95b99 100644
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--- a/tests/auto/network/access/http2/tst_http2.cpp
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+++ b/tests/auto/network/access/http2/tst_http2.cpp
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@@ -118,6 +118,8 @@ private slots:
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void redirect_data();
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void redirect();
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+ void abortOnEncrypted();
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+
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protected slots:
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// Slots to listen to our in-process server:
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void serverStarted(quint16 port);
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@@ -1024,6 +1026,48 @@ void tst_Http2::redirect()
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QTRY_VERIFY(serverGotSettingsACK);
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}
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+void tst_Http2::abortOnEncrypted()
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+{
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+#if !QT_CONFIG(ssl)
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+ QSKIP("TLS support is needed for this test");
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+#else
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+ clearHTTP2State();
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+ serverPort = 0;
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+
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+ ServerPtr targetServer(newServer(defaultServerSettings, H2Type::h2Direct));
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+
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+ QMetaObject::invokeMethod(targetServer.data(), "startServer", Qt::QueuedConnection);
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+ runEventLoop();
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+
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+ nRequests = 1;
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+ nSentRequests = 0;
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+
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+ const auto url = requestUrl(H2Type::h2Direct);
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+ QNetworkRequest request(url);
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+ request.setAttribute(QNetworkRequest::Http2DirectAttribute, true);
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+
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+ std::unique_ptr<QNetworkReply> reply{manager->get(request)};
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+ reply->ignoreSslErrors();
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+ connect(reply.get(), &QNetworkReply::encrypted, reply.get(), [reply = reply.get()](){
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+ reply->abort();
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+ });
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+ connect(reply.get(), &QNetworkReply::errorOccurred, this, &tst_Http2::replyFinishedWithError);
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+
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+ runEventLoop();
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+ STOP_ON_FAILURE
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+
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+ QCOMPARE(nRequests, 0);
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+ QCOMPARE(reply->error(), QNetworkReply::OperationCanceledError);
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+
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+ const bool res = QTest::qWaitFor(
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+ [this, server = targetServer.get()]() {
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+ return serverGotSettingsACK || prefaceOK || nSentRequests > 0;
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+ },
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+ 500);
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+ QVERIFY(!res);
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+#endif // QT_CONFIG(ssl)
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+}
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+
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void tst_Http2::serverStarted(quint16 port)
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{
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serverPort = port;
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